HP India — cost of printer cartridge after gst is exorbitant

Address:

Bangalore, Karnataka, 570016

Cost of printer cartridge before GST is Rs.906/- (MRP) and has been shown and sold at Rs.1, 288/- (MRP) after GST. i have already sought for clarification on this from hp, my complaint no is 1760092, no response till date. i had purchased a cartridge printer 802 small, for rs.1288/-. the price printed on the box before GST was Rs.906/- ( mrp price) and the price post GST was Rs. 1288/- (mrp price). When the highest GST rate is 28%, how is that theprice is increased to this extent by blaming the price increase on GST.